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  1. #1
    Genius FlatMaster's Avatar
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    Removing square taper cranks with damaged threads

    Unfortunately, the threads on my drive side cranks are damaged. I'm looking for some other way to remove the cranks. I know that with skill and the right tools, I could file off the first few threads. However, I don't think I have the skill for this. THis is my idea.

    Could one loosen the cup and lockring on the non-drive side as far as possible, then strike the spindle with a hammer? The fixed cup on the drive side would push the crank off of the spindle.

    Any other ideas for removal of a crank with damaged threads? The crankset is being replaced with a sealed bottom bracket, so destructive removal is a possibility.
    Ride or Die

  2. #2
    Senior Member
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    A gear puller from a auto parts store will pull them off.

  3. #3
    Genius FlatMaster's Avatar
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    Never seen one of thoes. Might get one just to own another cool tool.
    Ride or Die

  4. #4
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    Heat. Apply a torch or heat *** to the crank and then try to knock it off from the back using a heavy dowel or large diameter rod. Don't overdo it. You want to expand the crank, not melt it.

  5. #5
    cab horn
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    Quote Originally Posted by FlatMaster View Post
    Unfortunately, the threads on my drive side cranks are damaged. I'm looking for some other way to remove the cranks. I know that with skill and the right tools, I could file off the first few threads. However, I don't think I have the skill for this. THis is my idea.

    Could one loosen the cup and lockring on the non-drive side as far as possible, then strike the spindle with a hammer? The fixed cup on the drive side would push the crank off of the spindle.

    Any other ideas for removal of a crank with damaged threads? The crankset is being replaced with a sealed bottom bracket, so destructive removal is a possibility.
    You have 3 options

    1) Take it to a LBS with a wedge tool
    2) Automotive puller
    3) Grinder the crankarm in half

    When you say the crankset is being replaced with a sealed bb, you didn't actually tell us if destructive removal of the crankset itself is acceptable or not. The BB can always be replaced if the crankarm extractor threads are damaged if you don't care about the crank itself.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
    Senior Member sunburst's Avatar
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    Here's what I did:
    interesting tip for stuck cranks

    There were people who disagreed with the approach (and most on this forum know more than me!), but it worked. It only took a couple of tries also, and not much heat.

  7. #7
    Senior Member
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    I use a cold chisel and a hammer to hit the back of the crank arm at the centre beside the axle.
    it ussualy takes a couple of taps to pop the arm off.

  8. #8
    Call me The Breeze I_bRAD's Avatar
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    Quote Originally Posted by FlatMaster View Post
    Could one loosen the cup and lockring on the non-drive side as far as possible, then strike the spindle with a hammer? The fixed cup on the drive side would push the crank off of the spindle.
    Interesting idea. I'd remove the NDS cup entirely and be sure to properly support the BB shell before you get the hammer out.

  9. #9
    Old fart JohnDThompson's Avatar
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    If the threads aren't too badly damaged, you can clean them up with one of these:


  10. #10
    Senior Member EatMyA**'s Avatar
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    crowbar

  11. #11
    Gluteus Enormus mmmdonuts's Avatar
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    Remove the chainrings, unless you like scars.
    Apply heat to the crankarm spider just around the spindle area.
    Use 5/8 or bigger open ended wrench to pry it off from behind the crankarm. Between the back of the crank and the BB cup face. This is assuming you can fit the wrench back there.
    Everybody's got plans... until they get hit.
    - Mike Tyson

  12. #12
    Senior Member curbtender's Avatar
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    If the bike isn't too far dismanteled you can try riding around with the keeper bolt removed and see if that loosens it up.

  13. #13
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    When I was a kid and had never heard of a crank puller I used to just bash away at the crank with a hammer until it fell off. Sure it got marred, but I pulled that crank several times and it never broke.

    Hopefully it broke later while the SOB that stole it was riding!
    The will to win is nothing without the will to prepare. -Juma Ikangaa

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